September

October

November

KW

Mo

Di

Mi

Do

Fr

Sa

So

44

27

28

29

30

31

1

2

45

3

4

5

6

7

8

9

46

10

11

12

13

14

15

16

47

17

18

19

20

21

22

23

48

24

25

26

27

28

29

30

December

KW

Mo

Di

Mi

Do

Fr

Sa

So

49

1

2

3

4

5

6

7

50

8

9

10

11

12

13

14

51

15

16

17

18

19

20

21

52

22

23

24

25

26

27

28

01

29

30

31

1

2

3

4

The year 1980s maximum week number is WN 52. 1980 starts on
Tuesday, January 1st 1980 and ends on Wednesday, December 31st 1980.
One year has up to 53 week numbers. The first week of the year (WN 1) is the week containing january 4th or the first tuesday of the Year.

This is a private project of Thomas Lemmé
week-number.net offers a calendar with Week Numbers.